There’s one more thing you can change. The ISO.As far as exposure is concerned f2.8 on an APS-C lens is the same as f2.8 on a FF lens and 4.0 on a FF lens is the same as 4.0 on an aps-c lens. So, for exposure, f7.1 on the 24-105 will be 2/3 of a stop slower than F5.6 on an aps-c.
Full Frame: 105mm, f7.1, 1/100s, ISO=250
APSC: 65mm, f4.4, 1/100s, ISO=100
both will produce an equal angle of view, equal depth of field, equal exposure and even equal amount of noise on same generation sensors.
The lenses would be probably even very similar in weights and sizes.
The main difference between FF and APSC is actually the availability of native lenses.